Payment via Cryptocurrency
I think having cryptocurrency as a payment method would provide more privacy to the user if Proton wants to push the idea of privacy. Accepting anonymous cryptocurrency like Monero would allow Proton to get more users and provide a safe, secure, and private method of payment.

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Delaris Hohrein commented
Auf der Suche nach Lösungen für meine erektile Dysfunktion stieß ich auf die Seite Potenzmittel Testpaket https://24apotheke.de/catalogue/potenzmittel-testpaket-generika. Die Website war einfach zu navigieren, und die verschiedenen angebotenen Pakete waren beeindruckend. Ich konnte die Wirksamkeit verschiedener Potenzpillen vergleichen und eine auswählen, die zu mir passte. Das war ein Lebensretter!
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ohoh commented
Please understand that cryptocurrency is not private at all. https://www.science.org/content/article/why-criminals-cant-hide-behind-bitcoin The article is a little older, but crypto has not fundamentally changed and it should definitely not be considered private, even with mixers/tumblers you risk having all your transactions traced back to you.
However, cryptocurrency can still be a valid payment method if other options are not accessible to somebody, like when they cannot open a bank account or acquire a credit card.